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I've been trying to figure out what's going on with my external display
port screens with no luck....but I think I'm getting closer to the right
direction.

I upgraded to the latest 13.10 build and turned on DRM debugging with:

# /etc/modprobe.d/drm.conf
# We are turning on debug information here

options drm debug=0xe

In doing so my logs lit up with lots of graphics activity. However the
two events that actually had some meaning in terms of a pain point where
lines like this:

Oct 12 11:22:02 rnavarro-thinkpad kernel: [  673.201706] [drm:ironlake_irq_handler], Pipe B FIFO underrun
Oct 12 11:22:02 rnavarro-thinkpad kernel: [  673.201719] [drm:cpt_serr_int_handler], PCH transcoder B FIFO underrun

and

Oct 12 11:22:31 rnavarro-thinkpad kernel: [  702.411812]
[drm:ironlake_irq_handler], Pipe A FIFO underrun

I noticed that right before either one of my monitors would blank and
shut off, this message would be emitted in my kern.log

I think there was some stuff added upstream to detect this, as noted
here:

http://lists.freedesktop.org/archives/intel-gfx/2013-July/029882.html

But i'm not sure what's causing it, much less how to fix it.

What other information can I give that would help debug?

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: xserver-xorg-video-intel 2:2.99.904-0ubuntu2
ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
Uname: Linux 3.11.0-12-generic x86_64
ApportVersion: 2.12.5-0ubuntu2
Architecture: amd64
CompizPlugins: [core,composite,opengl,decor,regex,mousepoll,imgpng,vpswitch,grid,wall,gnomecompat,animation,compiztoolbox,move,place,snap,resize,unitymtgrabhandles,workarounds,fade,expo,session,scale,ezoom,unityshell]
CompositorRunning: None
Date: Sat Oct 12 11:45:47 2013
DistUpgraded: 2013-10-12 10:47:24,030 DEBUG enabling apt cron job
DistroCodename: saucy
DistroVariant: ubuntu
DkmsStatus:
 i915-3.9-3.8, 0.02, 3.8.0-31-generic, x86_64: installed
 vboxhost, 4.2.18, 3.11.0-12-generic, x86_64: installed
 vboxhost, 4.2.18, 3.8.0-31-generic, x86_64: installed
ExtraDebuggingInterest: Yes
GraphicsCard:
 Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0126] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Lenovo Device [17aa:21da]
InstallationDate: Installed on 2013-06-30 (103 days ago)
InstallationMedia: Ubuntu-GNOME 13.04 "Raring Ringtail" - Release amd64 (20130424)
MachineType: LENOVO 4286CTO
MarkForUpload: True
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.11.0-12-generic root=/dev/mapper/vg_rnavarro--leno-lv_root ro quiet splash i915.semaphores=0 vt.handoff=7
SourcePackage: xserver-xorg-video-intel
UpgradeStatus: Upgraded to saucy on 2013-10-12 (0 days ago)
XorgConf:
 Section "Device"
         Identifier "intel"
         Driver "intel"
         Option "AccelMethod" "sna"
 EndSection
dmi.bios.date: 02/14/2012
dmi.bios.vendor: LENOVO
dmi.bios.version: 8DET58WW (1.28 )
dmi.board.asset.tag: Not Available
dmi.board.name: 4286CTO
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvr8DET58WW(1.28):bd02/14/2012:svnLENOVO:pn4286CTO:pvrThinkPadX220:rvnLENOVO:rn4286CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 4286CTO
dmi.product.version: ThinkPad X220
dmi.sys.vendor: LENOVO
version.compiz: compiz N/A
version.ia32-libs: ia32-libs 20090808ubuntu36
version.libdrm2: libdrm2 2.4.46-1
version.libgl1-mesa-dri: libgl1-mesa-dri 9.2.1-1ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental 9.2.1-1ubuntu3
version.libgl1-mesa-glx: libgl1-mesa-glx 9.2.1-1ubuntu3
version.xserver-xorg-core: xserver-xorg-core 2:1.14.3-3ubuntu1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu3.1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.2.0-0ubuntu10
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.904-0ubuntu2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.9-2ubuntu1
xserver.bootTime: Sat Oct 12 11:20:57 2013
xserver.configfile: /etc/X11/xorg.conf
xserver.errors:
 
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id                               16510 
 vendor                                     DEL
xserver.version: 2:1.14.3-3ubuntu1
--- 
ApportVersion: 2.12.5-0ubuntu2
Architecture: amd64
CompizPlugins: [core,composite,opengl,decor,regex,mousepoll,imgpng,vpswitch,grid,wall,gnomecompat,animation,compiztoolbox,move,place,snap,resize,unitymtgrabhandles,workarounds,fade,expo,session,scale,ezoom,unityshell]
CompositorRunning: None
DistUpgraded: 2013-10-12 10:47:24,030 DEBUG enabling apt cron job
DistroCodename: saucy
DistroRelease: Ubuntu 13.10
DistroVariant: ubuntu
DkmsStatus:
 i915-3.9-3.8, 0.02, 3.8.0-31-generic, x86_64: installed
 vboxhost, 4.2.18, 3.11.0-12-generic, x86_64: installed
 vboxhost, 4.2.18, 3.8.0-31-generic, x86_64: installed
ExtraDebuggingInterest: Yes
GraphicsCard:
 Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0126] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Lenovo Device [17aa:21da]
InstallationDate: Installed on 2013-06-30 (106 days ago)
InstallationMedia: Ubuntu-GNOME 13.04 "Raring Ringtail" - Release amd64 (20130424)
MachineType: LENOVO 4286CTO
MarkForUpload: True
Package: xserver-xorg-video-intel 2:2.99.904-0ubuntu2
PackageArchitecture: amd64
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.11.0-12-generic root=/dev/mapper/vg_rnavarro--leno-lv_root ro quiet splash i915.semaphores=0 vt.handoff=7
ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
Tags:  saucy ubuntu
Uname: Linux 3.11.0-12-generic x86_64
UpgradeStatus: Upgraded to saucy on 2013-10-12 (2 days ago)
UserGroups: adm audio cdrom dialout dip fax floppy fuse lpadmin mythtv netdev plugdev sambashare scanner sudo tape vboxusers video wireshark
dmi.bios.date: 07/18/2013
dmi.bios.vendor: LENOVO
dmi.bios.version: 8DET69WW (1.39 )
dmi.board.asset.tag: Not Available
dmi.board.name: 4286CTO
dmi.board.vendor: LENOVO
dmi.board.version: Not Available
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias: dmi:bvnLENOVO:bvr8DET69WW(1.39):bd07/18/2013:svnLENOVO:pn4286CTO:pvrThinkPadX220:rvnLENOVO:rn4286CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 4286CTO
dmi.product.version: ThinkPad X220
dmi.sys.vendor: LENOVO
version.compiz: compiz N/A
version.ia32-libs: ia32-libs 20090808ubuntu36
version.libdrm2: libdrm2 2.4.46-1
version.libgl1-mesa-dri: libgl1-mesa-dri 9.2.1-1ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental 9.2.1-1ubuntu3
version.libgl1-mesa-glx: libgl1-mesa-glx 9.2.1-1ubuntu3
version.xserver-xorg-core: xserver-xorg-core 2:1.14.3-3ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu3.1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.2.0-0ubuntu10
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.904-0ubuntu2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.9-2ubuntu1
xserver.bootTime: Tue Oct 15 08:39:05 2013
xserver.configfile: default
xserver.errors:
 
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id                                 728 
 vendor                                     LGD
xserver.version: 2:1.14.3-3ubuntu2

** Affects: xserver-xorg-video-intel
     Importance: Medium
         Status: Fix Released

** Affects: linux (Ubuntu)
     Importance: High
     Assignee: Ricardo Salveti (rsalveti)
         Status: In Progress


** Tags: amd64 apport-bug apport-collected cherry-pick latest-bios-1.39 saucy ubuntu
-- 
[Lenovo ThinkPad X220] External screens shut off randomly
https://bugs.launchpad.net/bugs/1239186
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